參數(shù)資料
型號: P610ARM-FPNR
廠商: Zarlink Semiconductor Inc.
英文描述: General purpose 32-bit microprocessor
中文描述: 通用32位微處理器
文件頁數(shù): 58/173頁
文件大?。?/td> 897K
代理商: P610ARM-FPNR
Instruction Set - LDR, STR
ARM610 Data Sheet
4-30
O
4.8
Halfword and Signed Data Transfer
(LDRH/STRH/LDRSB/LDRSH)
The instruction is only executed if the condition is true. The various conditions are
defined in
·
Table 4-2: Condition code summaryon page 4-6. The instruction encoding
is shown in
·
Figure 4-14: Halfword and signed data transfer with register offset
below, and
·
Figure 4-15: Halfword and signed data transfer with immediate offseton
page 4-31.
These instructions are used to load or store halfwords of data and also load
sign-extended bytes or halfwords of data. The memory address used in the transfer is
calculated by adding an offset to or subtracting an offset from a base register. The
result of this calculation may be written back into the base register if auto-indexing is
required.
Figure 4-14: Halfword and signed data transfer with register offset
31
28 27
25
24
23
22
21
20 19
16 15
12 11
8
7
6
5
4
3
0
Cond
00010
P
U
0
W
L
Rn
Rd
0
0
0
0
1
S H
1
Rm
Offset register
S H
00 = SWP instruction
01 = Unsigned halfwords
10 = Signed byte
11 = Signed halfwords
Source/Destination register
Base register
Load/Store
0 = store to memory
1 = load from memory
Write-back
0 = no write-back
1 = write address into base
Up/Down
0 = down: subtract offset from base
1 = up: add offset to base
Pre/Post indexing
0 = post: add/subtract offset after transfer
1 = pre: add/subtract offset before transfer
Condition field
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